[mrtg] Re: Need help with config for monitoring interface err ors

Roth, Gabrielle gabrielle.roth at xo.com
Tue Dec 4 17:14:10 MET 2001

Wait a second.

Assuming you're using ifInErrors & ifOutErrors, these OIDs are type
"Counter" and should therefore be used with the "default" mrtg setup, ie,
not with the gauge option, right?  (I reserve the use of the gauge option
for OIDs of type "Gauge" and "Integer" as they do not increment over time.)

Hopefully, the amount of errors is very low, and you are running into the
problem of not having enough data for mrtg to notice.  *Usually* this is
solved by using the 'perminute' or 'perhour' options.  John, when you say
the spike "disappears", do you mean the graph is redrawn and the data is
missing (that sounds really weird) or do you mean it goes back to nothing?

Have you tried manually collecting your data (snmpwalk) and comparing it to
what you are seeing in mrtg?  Most of the time this will give you a huge
clue as to the problem and how to solve it.

"Five out of four people have a problem with math."

(Originals trimmed to avoid the QuotePolice)

>It will do because you don't have GAUGE in your options.
>Without the GAUGE option MRTG will monitor the difference from 
>the previous poll, GAUGE will plot the same value that's returned and the 
>values will just keep getting bigger and bigger over time.
>-----Original Message-----
>From: John Thatcher [mailto:johnt at cmanet.com.au]
>Sent: 04 December 2001 06:34
>To: mrtg at list.ee.ethz.ch
>Subject: [mrtg] Need help with config for monitoring interface errors

>I have tried everything to produce a graph of interface errors 
>for a Cisco router, and it only seems to work if I use the gauge option 
>(which shows all the historical data).
>However, I would like to just graph the errors as they occur over time.
>I have tried the "* 300" multiplier after the target without the gauge
>option, - and sometimes I see a current spike on the graph 
>when I generate an error on the line, but then it disapears after the next 
>5min interval.

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